Receiver



June 17925 E. B. NOWOSIELSKI RECEIVER Filed April 12 1922 Fig.2

- I/VVE/VTOR En wmeo .B. Norms/1. s/r/ A TTORN Y Patented June 2, 1925.

UNITED STATES PATENT OFFICE."

EDWARD B. NOWOSIELSKI, 0F BLOOMFIELD, JERSEY, ASSIGNOR T0 SPLITDORF ELECTRICAL COMPANY, OF NEWARK, NEW JERSEY.

RECEIVER.

Application filed April 12, 1922.

To all whom it may concern:

Be it known that I, EDWARD B. NowosInL- SKI, a citizen of the United States, residing at Bloomfield, in the county of Essex, State of New Jersey, have invented certain new and useful Improvements in Iteceivers,.of

which the following is a description, referonce being had to the accompanying drawing, and to the figures of reference marked thereon.

This invention is directed to an electric current receiver suitable for receiving currents set up by the voice or radio waves and such like.

It is the principal object of my invention to provide a receiver'which is first of all highly efficient, yet one in which the construction is very simple whereby the cost of manufacture may be reduced to a minimum. Particular attention is directed to the details of construction which will be hereinafter set forth, as it will be seen that I have eliminated all drilling and tapping of holes in the receiver casing, the only threads at all being on the body part of the casing where the ear piece is screwed on.

The construction of my receiver is such that the assembly operations are reduced to a minimum as will be apparent from the description and drawing, wherein:

Figure 1 is a plan view of the receiver with the ear cap and diaphragm removed.

Figure 2 is a section on the line 22 of Fig. 1.

In the drawings, 1 is the body of the easing having an ear cap 2 with a. diaphragm 3 held in proper operative position. While the diaphragm 3 is shown as held on the rim of the casing 1 by the cap 2, it will be understood that the diaphragm maybe held in any other suitable manner; also the casing 1 may be of any suitable material, but for certain purposes I prefer to use a metal body of any non-magnetic material such as aluminum. The casing 1 has a stud 4 which is used for mounting the receiver on a head band. This feature will be referred to in a separate application covering a particular type of head band. The side wall of the casing 1 has an aperture therein and positioned in this aperture is av terminal block 5 which is shouldered at 6, whereby the reduced portion of the terminal block 5 may be inserted through the aperture from the inside of the casing, shoulder 6 acting as a Serial No. 551,873.

ends of the magnet 13, which engage the said surfaces 12 for a reason which will be presently pointed out. The magnet 13 is preferably of one-piece construction, rectangular in cross-section and set edgewise in the casing. It will be noted that. the magnet is circular in form and forms nearly a complete circle. The ends of the magnet are formed or milled off to form a flat positioning surface for the pole pieces 14 and 15. These pole pieces are preferably of laminated construction as shown and are substantially T-shaped, the vertical portion of the T resting against the inner faces of the ends of the magnet, while the horizontal portions 16 have one end resting against the bottom of the casing 1 and the upper ends 17 extending to the proper working distance from the diaphragm 3. The vertical portions of the pole pieces having windings 18 and 19 thereon, the outer ends of the wind-' ings being connected to the terminals 7 and 8. As will be seen from the drawing the pole pieces 14 and 15 extend toward the central portion of the casing and the horizontal portions 16 are engaged by a bridge memer 20 that is milled out so as to securely clamp these ends of the pole pieces, holding them in properly spaced relationship. The bridge 20 is screw threaded for the reception of a stud 21 that abuts against the magnet 13 at 22 substantially diametrically opposite the terminal block.

In the assembly of my receiver, the terminal block 5 is put into position as already described, the magnet 13 dropped into place, windings 18 and 19 slipped onto the pole pieces 14 and 15, which are then placed in position so that their ends also abut against the surface 12 of the block 5, as well as against the ends of the magnet 13. The bridge 20 to which the stud 21 has already been assembled is then placed over the portion 16 of the pole pieces and a'wrench applied'to the hex portion 23, forcing the bridge 20 radially against the pole pieces which in turn press against the magnet 13 and thereby press against the block 5 on the tapered surfaces 12, when the stud 21 has been set up so that the parts are all securely in position. The lock nut 24; is screwed down against the bridge 20 and the final operation of finishing the air gap between the diaphragm and ends 17 can be performed.

From the above description it will be particularly noted that there are no tapped holes in the receiver casing and that the entire assembly of the parts can be performed in a matter of seconds. To the terminals 7 and 8 are attached gap terminals 25 and 26 which are sometimes used for the purpose of taking care of static disturbances.

The pole pieces herein described are of such construction that the length of turns on the windings 18 and 19 are relatively short so that I can use a larger wire than ordinarily used, particularly for radio receivers; at the same time securing a large number of turns whereby I get the maximum effect between the windings and the magnetic field set up by the magnet. I have found that this construction enables me to use a thicker diaphragm than ordinarily used for radio work and this thicker diaphragm is more susceptible to high frequencies as its natural period of vibration is higher than that of a thinner diaphragm.

It will be understood by one skilled in this art that my invention is susceptible of a number of changes in the actual details of construction, but it is my intention to cover these equivalent forms in the appended claims.

Having thus described my invention, what I claim is:

1. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a magnet having pole pieces abutting against its extremities, said pole pieces extending toward the central portion of the casing into operative relationship with the diaphragm and having windings thereon and means pressing against said pole pieces at points near the central portion of the casing for holding them securely against the magnet ends.

2. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a one piece magnet having pole pieces abutting against its extremities, said pole pieces extending toward the central ortion of the casing into operative relat1onship with the diaphragm and having windings thereon and means abutting against the magnet at a point some distance from the point of contact of said pole pieces with the magnet and pressing against the pole pieces at points near the central portion of the casing for holding the magnet and pole pieces in position in the casing.

3. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a one piece magnet having pole pieces abutting against its extremities, said pole pieces extending toward the central portion of the easing into operative relationship with the diaphragm and having windings thereon, a bridge engaging the inner ends of said pole pieces, a stud screw threaded into said bridge and abutting against said magnet for holding the pole pieces and magnet in position in the casing.

4. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a one piece magnet having pole pieces abutting against its extremities, said pole pieces extending toward the central portion of the casing into operative relationship with the diaphragm and having windings thereon, a bridge of non-magnetic material having notches to grip the inner ends of said pole pieces, and a non-magnetic stud screw threaded into said bridge and abutting against said magnet for holding the pole pieces and magnet in position in the casing.

5. In a device of the class described, a 0215- ing consisting of, a body and an ear piece with a dlaphragm associated therewith, a one piece magnet rectangular 1n cross-section set edgewise within the casing, pole pieces abutting against the inner faces of its ends and extending toward the central portion of the casing into operative relationship with the diaphragm and having windings thereon, a bridge of non-magnetic material having notches to hold the inner ends of the pole pieces in spaced relationship and a non-magnetic stud abutting against the magnet and engaging said bridge to cause it to press the said pole pieces into engagement with the magnet ends.

6. In a 'device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a magnet having pole pieces abutting against its extremities, said pole pieces being made up of T-shaped lamin'ations, the vertical portion of the T having windings thereon and abutting against the ends of the magnet, while the horizontal portion of the T has one end resting against the bottom of the casing and the top extending into-position to act on the diaphragm, a bridge engaging the horizontal rtion of the T, a stud abutting against t e magnet and forcing the bridge, pole pieces and magnet into a locked position in the casing.

7. In a device of the class described. a casing consisting of, a. body and an ear piece with a diaphragm associated therewith, a

one piece magnet forming nearly a complete circle, pole pieces engaging the inner part of the ends of said magnet and extending toward the central part of the casing, a bridge member engaging the inner ends of said pole pieces holding them in spaced relationship, windings on said pole pieces, a stud positioned in the central part of the magnet and engaging said bridge and having means for forcing the bridge against the pole pieces to bind them and the magnet in position in the casing.

8. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a magnet, pole pieces for the magnet, windings on said pole pieces, a bridge for engaging said pole pieces and a stud abutting against the magnet and engaging the bridge to force the bridge, pole pieces and magnet into working position in the casing.

9. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a one piece magnet forming nearly a complete circle, pole pieces engaging the inner part of the ends of said magnet and extending toward the central part of the casing, a bridge member engaging the inner ends of said pole pieces holding them in spaced relationship, windings on said pole pieces, a stud positioned in the central part of the magnet and engaging said bridge and having means for forcing the bridge against the pole pieces to bind them and the magnet in position in the casing, an aperture in the side wall of the casing and a terminal block positioned in the aperture and in the opening between the ends of the magnet.

10. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, an aperture in the side wall of the easing, a terminal block positioned in said aperture, a magnet having its ends abutting against said block, pole pieces for the magnet with windings thereon, a bridge member engaging the gple pieces and a stud abutting against t e magnet and adapted to hold the bridge, pole pieces, magnet and block in operative position in the casing.

11. In a device of the class described, a

casing consisting of, a body and an ear piece with a diaphragm. associated therewith, an aperture in the side wall of the casing, a terminal block positioned in said aperture, said block having its inner sides somewhat tapering toward the center of the casing, a; magnet having its ends abutting against the tapered sides of the block, pole pieces engaging the ends of said magnets so as to bear jointly with the magnet ends against the tapered sides of the block, windings on said pole pieces, a bridge engaging and supporting the inner ends of the pole pieces and means for forcing the pole pieces and magnet against the block and the casing.

12. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a magnet having pole pieces to act on the diaphragm, windings on said pole pieces, a terminal block of insulating material having terminals connected to said windings, a spark gap carried by said terminals within the casing, a bridge engaging said pole pieces and a single means for locking said block, magnet, pole pieces and bridge in operative position within the casing.

13. In a device of the class described, a casing consisting of, a body and an ear piece with a diaphragm associated therewith, a one piece magnet rectangular in cross-section placed edgewise in the casing, a terminal block of non-magnetic material positioned between the ends of the magnet and having terminals insulated from each other, T-shaped pole pieces having the vertical part of the T resting against the ends of the magnet alongside the block, windings on the pole pieces and connected to said terminals, the horizontal portion of the T resting against the bottom of the easing and extending to a point near the diaphragm, a bridge engaging this latter part of the pole pieces and a device for forcing the bridge against said pole pieces to lock them, the magnet and block in position in the casing.

In testimony whereof, I afiix my signature.

EDWARD B. NOWOSIELSKI. 

